27858241785851 has 4 divisors (see below), whose sum is σ = 27908256583152. Its totient is φ = 27808226988552.

The previous prime is 27858241785757. The next prime is 27858241785877. The reversal of 27858241785851 is 15858714285872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27858241785851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27858241785251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25007397815 + ... + 25007398928.

It is an arithmetic number, because the mean of its divisors is an integer number (6977064145788).

Almost surely, 2^{27858241785851} is an apocalyptic number.

27858241785851 is a deficient number, since it is larger than the sum of its proper divisors (50014797301).

27858241785851 is an equidigital number, since it uses as much as digits as its factorization.

27858241785851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50014797300.

The product of its digits is 401408000, while the sum is 71.

The spelling of 27858241785851 in words is "twenty-seven trillion, eight hundred fifty-eight billion, two hundred forty-one million, seven hundred eighty-five thousand, eight hundred fifty-one".